Explore how ionic, covalent and metallic bonding models account for structure and properties. Practise drawing representations, predicting geometry and polarity, comparing bond…
How many electrons will be gained or lost when the element with electron configuration 1s22s22p3 forms an ionic bond?
Two electrons lost
Two electrons gained
Three electrons lost
Three electrons gained
D
Ethyne, C2H2, reacts with oxygen in welding torches.
Deduce the Lewis (electron dot) structure of ethyne.
H:C::C:H/H−C≡C−H
Marking guidance:
Accept any valid combination of lines, dots and crosses.
Compare, giving a reason, the length of the bond between the carbon atoms in ethyne with that in ethane, C2H6.
«ethyne» shorter AND a greater number of shared/bonding electrons OR
«ethyne» shorter AND stronger bond
Identify the type of interaction that must be overcome when liquid ethyne vaporizes.
London/dispersion/instantaneous dipole-induced dipole forces
Marking guidance:
Do not accept just "intermolecular forces" or "van der Waals' forces".
Iron may be extracted from iron (II) sulfide, FeS.
Outline why metals, like iron, can conduct electricity.
mobile/delocalized <<sea of >> electrons
Iron (II) sulfide, FeS , is ionically bonded.
Describe the bonding in this type of solid.
electrostatic attraction between oppositely charged ions/between Fe2+ and S2−
Suggest why chemists find it convenient to classify bonding into ionic, covalent and metallic.
allows them to explain the properties of different compounds/substances OR enables them to generalise about substances
OR enables them to make predictions
Marking guidance:
Accept other valid answers.